생물학적 산화를 활용한 비가시성 금정광 내 Au, Ag 품위 향상
Application of Biological Oxidation for the Grade Improvement of Au and Ag in An Invisible Gold Concentrate
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비가시성 금정광 내 Au, Ag 등 유용금속의 품위를 향상시키기 위하여 토착박테리아(Acidithiobacillus ferrooxidans)를 활용한 생물학적 산화용출을 실시하였다. 이때, 산화용출 기작의 촉진을 위하여 심해저 망간각을 산화제로 첨가하여 반응 동안 발생하는 다양한 생지구화학 반응을 고찰하였다. 금정광의 산화용출 동안 용출용액의 pH 는 감소하고, 용출용액 내 Cu, Fe, Mn 이온의 함량은 증가하다가 평형에 도달하였다. 박테리아 생물학적 산화와 망간각 산화제가 첨가된 금정광의 용출실험 종료 이후 회수된 금정광 잔류물에서 Au와 Ag의 품위가 동일하게 33.1% 향상되었다.
Abstract
To upgrade the contents of Au and Ag in an invisible gold concentrate, we conducted bioleaching using indigenous bacteria (Acidithiobacillus ferrooxidans). During the bioleaching, a manganese crust was used as oxidant. As the bioleaching of the gold concentrate progressed, the pH of the eluate medium decreased, while the contents of metal ions (e.g., Cu, Fe and Mn) in the eluate medium increased. After the completion of bioleaching, the contents of insoluble Au and Ag in the gold concentrate residue were higher and their grades improved by 33.1% as compared to the raw gold concentrate.
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